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Chemical methods for various dyes


Release time:

2023-07-28

1. direct dyes: direct dyes have relatively good heat resistance stability. direct dyes can be dissolved by adding soda ash soft water. when mixing materials, the dyes are first mixed into slurry with cold soft water, then boiled with soft water, stirred and dissolved, diluted with heated water, and then added with water to the specified liquid volume after cooling.

1. direct dyes:

direct dyes have relatively good heat resistance stability. direct dyes can be dissolved by adding soda ash soft water. when mixing materials, the dyes are first mixed into slurry with cold soft water, then boiled soft water is stirred to dissolve, heated water is diluted, and water is added to the specified liquid volume after cooling.

2. reactive dye:

This kind of dye is not heat-resistant and easy to hydrolyze at high temperature. It is appropriate to use cold soft water to make slurry. According to the hydrolytic stability of different dyes, it is dissolved in soft water at appropriate temperature, diluted by heating soft water, and added soft water to the specified liquid volume after cooling.

Low Temperature Type (X Type): Use cold water or 30-35 ℃ warm water (basically eliminated)

High Temperature Type (K Type, HE Type, etc.) Use 70-80 ℃ hot water

Medium Temperature Type (KN, M Type) Use 60-70 ℃ hot water

with low solubility and 90 ℃ hot water

to 3. vat dye: the dissolution process of

vat dye is a reduction reaction process. When dissolving, the temperature of dissolution should be determined according to the reduction conditions of the reducing agent used. Such as reduced dyes commonly used reducing agent is insurance powder, the best use temperature in the solution is 60 ℃, the temperature is too high will lead to a large number of insurance powder decomposition.

(1) full bath method:

dye is put into a dyeing cup, red oil and a small amount of warm soft water are added successively to mix well, then a specified amount of caustic soda and sodium hydrosulfoxide are added, soft water is added to the required bath amount, and reduced at 55 ℃.

(2) dry cylinder method:

dye is put into a dye cup, red oil and a small amount of warm soft water are added successively to mix evenly, then 2/3 the amount of caustic soda and sodium hydrosulfite are added to make the amount of dye solution 1/3 of the total amount. The dissolution temperature shall be determined according to the reduction conditions of the reducing agent used. Add the remaining caustic soda and sodium hydrosulfite to the dyeing cup and add soft water to the required bath volume.

4. sulfur dye:

accurately weigh the required amount of dye in a beaker, mix it into slurry with cold soft water, then add sodium sulfide dye solution dissolved in advance, and boil for 10min. Heat soft water to dilute, add soft water to the specified liquid volume after cooling.

5. Disperse Dyes:

Disperse Dyes tend to crystallize out if the temperature is too high. When the material is mixed, the slurry should be mixed with cold soft water first, then the cold soft water below 40 ℃ is used, and the soft water is added to the specified liquid volume.

6. acid dye:

acid dye has relatively good heat resistance stability. when acid dye is mixed, the dye is first mixed into slurry with cold soft water, then boiled with soft water, stirred and dissolved, heated with soft water for dilution, and added with soft water to the specified liquid volume after cooling.

7. cationic dye:

cationic dye has relatively good heat resistance stability. when mixing materials, the dye is first mixed into slurry with concentrated acetic acid (solubilizing), then boiled with soft water, stirred and dissolved, diluted with heated water, cooled and added with soft water to the specified liquid volume.


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